To be honest, I've considered Dragonball Super something of a reboot that still shares maybe 90% of the mythos of the original. Plus, wasn't all that stuff about Bardock and King Vegeta anime-exclusive? They did that a lot back then.

In the end, this really doesn't contradict anything in the original story. Freiza conquers Planet Vegeta, then blows it up. Goku flies to Earth. This prologue doesn't change the story in the long run.

Slight correction, Frieza is not naked. He still has those tight speedos of his (and he's been naked most of the time anyhow. There's nothing there, so big whoop)